Classifications

• • A—HUMAN NECESSITIES
  • A46—BRUSHWARE
  • A46D—MANUFACTURE OF BRUSHES
  • A46D9/00—Machines for finishing brushes
  • A46D9/02—Cutting; Trimming
  • A46D9/025—Deflecting parts of the bristle field in order to trim the rest
• • A—HUMAN NECESSITIES
  • A46—BRUSHWARE
  • A46D—MANUFACTURE OF BRUSHES
  • A46D9/00—Machines for finishing brushes
  • A46D9/02—Cutting; Trimming

Definitions

• the present invention relates to a device for isolating bristles affixed to a toothbrush head and finishing the free ends of said bristles into a generally rounded form.
• the present invention pertains to a bristle separating fork for use in bristle-end finishing operations which impart improved end- roundedness of the finished bristles.
• the present invention relates to a device for isolating and end-rounding bristles affixed to a toothbrush head.
• toothbrushes with contoured bristle heights can enhance the performance of a toothbrush.
• Toothbrushes with sinusoidal or serrated bristle height patterns have been used, as well as various stepped and smoothed bristle trimming patterns.
• contoured bristle patterns exhibit inferior end rounding when performed on a simple orbital grinder as described in the Hazelton patent. If a bristle grinder is set to end round the tallest bristles, the shorter bristles are not rounded to any significant degree. Conversely, grinder penetration sufficient to end round the shorter bristles damages and distorts the ends and the side wall of the longer bristles.
• brushes which contain bristle tuft bundles of varying length can be processed on more than one machine. This has been accomplished by stuffing short bristle tuft bundles, trimming them to height and finishing the tips if desired, followed by incremental stuffing, cutting and finishing steps for each longer tuft bundle size. This procedure is slow, and very costly from a capital investment standpoint since several bristling machines are required on each production line.
• the most common, and cost effective method of processing toothbrushes with bristles of varying heights involves using a means of isolating bristles of a particular height during each processing step. Typically, this is done by way of a template, shield or plow to protect non-isolated bristles while the isolated ones are subjected to a processing step.
• German Patent application 1 532 773 (assigned to Gottlieb Ebser) discloses a device having an elongated deflection template (7h) which is moved down upon the head of a toothbrush, deflecting the bristles it contacts away from the select rows of bristles to be isolated. Thus the isolated bristles could be processed without disturbing the deflected bristles.
• This patent also describes two catch plates (8i and 8h) which wrap around and hug the outer rows of bristles while they are cut to a specific height. This patent appears to be silent on the use of end rounding.
• German patent 3 415 870 (assigned to Anton Zahoransky) discloses a machine for treating the tufts of bristles and brushes such as cutting or smoothing them down.
• pressure is exerted on the outer ends of the longer tufts of bristles by means of a u- shaped cross-sectional pressure piece (8) .
• a u- shaped cross-sectional pressure piece (8) a u- shaped cross-sectional pressure piece
• European patent 0 078 569 (assigned to G. B. Boucherie, n.v.) relates to a device for separating rows of brush tufts.
• the device utilizes a fork-like separator with two knife ⁇ like prongs.
• the fork is introduced through a parallel motion between the knife and brush so that at least one row of brush tufts can be curved away to the side.
• the non- displaced bristles can be processed in a trimming and end rounding operation.
• Forks of this kind are not new in the toothbrush manufacturing art
• US patent 132,031 to J. Stone (issued October 8, 1872) describes a toothbrush trimmer which utilizes a forked bristle holder (E) to hold bristles to be treated in a trimming operation in place.
• US patent 5,143,425 discloses a device for cutting bristles of a toothbrush to different lengths in different selected areas of a tuft pattern.
• This device utilizes a shield member which is moved down over the bristles to be isolated.
• the shield member also comprises a ramp means which helps to push or plow the bristles away from the isolated bristles.
• toothbrush bristle displacing fork This fork is particularly suited for toothbrush bristle end finishing operations, e.g., end rounding. Accordingly, it is an object of the present invention to provide a bristle finishing fork for rounding the ends of toothbrush bristles affixed to a head which have been trimmed to different heights.
• This device isolates bristles of a particular length, finishes them and then incrementally isolates and then goes on to finish bristles of other lengths in subsequent incremental operations.
• the present invention relates to a bristle finishing fork for isolating bristles affixed to a toothbrush head within a bristle finishing region comprising two elongated prongs having tips spaced at a distance "A" defining the width of the bristle swath to be isolated, wherein starting at said tip, the distance between the prongs increases to a distance "B" defining the sidewall of the bristle finishing region.
• the present invention also relates to a two prong bristle finishing fork comprising: (a) a base plate; (b) two elongated prongs having a tip end and terminal end, said prongs being connected to said base plate at their terminal ends, wherein said prongs are spaced at a distance "A" defining the width of the bristle swath to be isolated, wherein, starting at the tip of the prong, the distance between the blades increases to a distance "B".
• the present invention still further relates to a device for isolating and end- rounding bristles affixed to a toothbrush head within a bristle finishing region comprising: (a) a means for holding a toothbrush with bristles affixed thereto; and (b) a bristle finishing fork comprising two elongated prongs having tips spaced at a distance "A" defining the width of the bristle swath to be isolated, wherein starting at said tip, the distance between the blades increases to a distance "B" defining the sidewall of the bristle finishing region, whereby said fork has a backwards and forwards motion, in such a way that the tip of said prongs can be introduced between toothbrush bristles through a parallel relative motion between fork and brush, so that the swath of bristles to be isolated are positioned in said bristle finishing region; and (c) a means for rounding the distal ends of the bristles positioned in said bristle finishing region
• Fig. 1 is an elevated top view of a bristle finishing fork according to the present invention
• Fig. 2 is an elevated bottom view of the bristle finishing fork according to Fig. 1;
• Fig. 3 is an end view of the bristle finishing fork of Figure 1 when viewed from the tip;
• Fig. 4 is an end view of the bristle finishing fork of Fig. 1 when viewed from the base plate end;
• Fig. 5 is a left side view of the bristle finishing fork of Fig. 1 inserted into the bristles of a toothbrush. (The right side view is a mirror image of Fig. 5) ;
• Fig. 6 is a cross-sectional view of the fork of Fig. 5 taken across section I-I of Fig. 1;
• Fig. 7 is a schematic view from above of a device according to the present invention.
• Fig. 8 is a side view of the device of Fig. 7;
• Fig. 9 is a view similar to the one of
• Fig. 10 is a cross-sectional view of Section II-II of Fig. 9. This view shows the deflection of non-isolated bristles;
• Fig. 11 is a view similar to the one of Fig. 10, but depicting an orbital grinder finishing the ends of the isolated bristles;
• Fig. 12 shows a schematically and top- elevational view of the various stages of the production on only one machine of a toothbrush with bristles trimmed to five different heights;
• Fig. 13 is a view similar to the one of Fig. 12, but in a second characteristic position. During this phase of the processing the forks are engaged and an orbital grinder is used to round the ends of the bristles which have been isolated. The orbital grinder is depicted by the "-•-" line;
• Fig. 14 is a view similar to the one of Figs. 12 and 13 but in a third characteristic position. In this position the forks are disengaged and the bristles are free to move into the next index position; and
• Fig. 15 shows the toothbrush produced by the process depicted in Figs. 12, 13 and 14.
• Figure 1 depicts a bristle finishing fork 1 according to the present invention.
• the fork is comprised of two elongated prongs, 2 and 3, having tips, 10 and 10' spaced at a distance "A" .
• this fork has a backwards and forwards motion relative to a toothbrush head 5, as depicted by arrow 4, in such a way that the tips 10 and 10' of said prongs 2 and 3 can be introduced between toothbrush bristles through a parallel relative motion between fork 1 and brush 5.
• the prongs, 2 and 3, are generally divided into a penetration region 6 and a bristle finishing region 7.
• prongs are further comprised of an inner blade edge surface 8 and an outer blade edge surface 9 wherein the outer bladed surfaces are effective at plowing r "istles away from the bristle finishing - ion.
• th- nner blade edge surface 8 and the outer bla ⁇ e edge 9 surface intersect at the tips 10 and 10' of the prong. Further, it is the tip-to-tip (10-to-lO') spacing which defines distance A.
• An important feature of the present invention lies in the characteristic that the distance between the prongs increases away from the tip to a distance n B" defining the side wall of the bristle finishing region. Applicants have discovered that by increasing this distance the bristles are allowed to sway during the end rounding process; thus providing improved rounding of the bristle ends.
• an arching transition 11 is preferably utilized between the penetration region 6 and finishing regions 7.
• the inner blade edge surface 8 and the outer blade edge surface 9, intersect at the tip 10 to form an acute angle ⁇ .
• the inner blade edge surface 8 and the outer blade edge surface 9 intersect at the tip 10 to form an angle of about 50 degrees ( ⁇ ) .
• the base plate 12 has two holes, 20 and 20', which are used as an affixing means for the fork. Any means of affixing known to those skilled in the art can be used.
• the fork is affixed to a sliding camlike member or to a mechanical insertion device such as a pneumatic drive, an electric drive or a magnetic drive.
• Fig. 3 shows an end view from the tip of the bristle finishing fork of Figs. 1 and 2. Prominently displayed are the lower surfaces 15 and 16 which slope away from the spaced A-A region 60. This sloping helps to displace bristles away from the finishing region and prevents their sliding back into the region.
• Figure 4 shows an end view from the base plate.
• the thickness of these forks is typically greater than 0.5 mm and preferably should be about 2 mm.
• Fig. 5 is a left side view of the fork of Figure 1.
• the brush side 61 (bottom) of the fork has a point 13 which extends in the direction of the brush. This point encounters the bristles first and is the initial separating means which directs non- isolated bristles away from the bristle finishing region 7.
• Fig. 6 is a cross-sectional view across lead lines I-I of Fig. 1.
• the prongs are preferably comprised of lower surfaces 15 and 16 for preventing plowed bristles from slipping into the bristle finishing region 7 (defined here by spacing "B") .
• the lower surfaces 15 and 16 intersects the inner blade edge surface 8 to form an acute angle ⁇ when viewed from the tip. Applicants have found that an acute angle of about 75 degrees provides the best plowing and retaining results.
• the device according to the invention mainly consists of a bristle finishing fork 1 which is fixed on a carriage, slide or similar means whereby this slide 30 can move in a parallel motion relative to the fork and the bristles to be isolated 40 (shaded) .
• said carriage, slide or similar means can be actuated by any mechanical means known in the art, such as, for example, by way of a pneumatic drive, a magnetic drive, springs, mechanical cam, etc.
• the fork could be stationary and the brush could be moved in and out.
• a support 41 is provided for, on which suitable clamping means 42 and 43 are mounted, which serve the purpose of suitably clamping a brush body 31 against a thrust block with respect to the fork 1, whereby, in the present case, the brush body has a region of bristles to be isolated 40 (shaded) and regions of bristles to be displaced 44 and 45.
• the prongs 2 and 3 show at their front end a slanting face tip 50 and 50', in order to aid the prongs' movement from the position as in Figure 7 to the position as in Figure 9.
• the outer bristles 44 and 45 are displaced through the penetration of the prongs between the regions 44/40 and 45/40, as is clearly shown in Figures 10 and 11. These outer bristles are pushed towards the outside, whereby the prongs have a width which is such that the tops 52 and 53 of the rows of brush hairs 44 and 45 will be brought to a lower level than the tops 55 of the bristles in the region to be isolated 40.
• the tip of the prong 13 exactly penetrates between the bristles at the base of these bristles, whereby the separation of the bristles is made easier.
• this penetration occurs at a transition point between bristles of different height; thus, retaining the original contour of the bristle trim pattern.
• the penetration region 7 is wider and slighxly longer than the actual displacement of the bristles in the head. This provides for superior bristle finishing characteristics when the bristles are finished in an end rounding operation.
• End rounding operations involve grinding or abrading the ends of the bristles to form a rounded appearance.
• end roundedness and the characteristic determinations used to quantify such, please see: Silverstone & Featherstone, Examination of the End Rounding Pattern of Toothbrush Bristles, Gerodontics, 4:2, pp 45-62 (1988); Nygaard-Ostby et al., Access to Interproxi al Tooth Surfaces by
• End rounding/abrasion processing is typically accomplished by use of elliptic orbital grinders like those described in US patent 3,451,173 to Hazelton, issued June 24, 1969, incorporated herein by reference, or by way of belt or drum sanders.
• rotating belt grinders are used in conjunction with the present invention as shown in Figure 11.
• the orbital grinder 60 is brought into contact with the tips 55 of the isolated bristles 40 thus causing them to oscillate, orbit and move liberally within the bristle finishing region 7.
• FIGS 12, 13 and 14 there is schematically shown how the device according to the invention can be used in order to further treat the brush bristles after tufting same whereby it should be noted that tufting brush hairs of different lengths is generally done by conveying bristles of different lengths from two containers or by trimming them in place using multiple trimming operations.
• FIGs 12, 13 and 14 are schematically shown the five work stations, 101, 102, 103, 104 and 105, respectively whereby in stations 101, 102, 103 and 104 the bristle finishing fork is used to isolate particular bristles according to the present invention.
• the brush heads 111, 112, 113, 114 and 115 are indexed into position within each work station.
• the regions which will be isolated and rounded at each work station are shown in shading 121, 122, 122', 123, 123', 124, 124', 125 and 125'.
• the critical dimensions of the processing forks are depicted in the following table:
• the distances A and B can be proportional.
• the dimensions depicted above can be modified as follows:
• FIG. 13 schematically shows the next stage in the processing scheme whereby forks 133, 134, 135 and 136 are brought into engagement with the bristles thus plowing the bristles outside the shaded regions away from bristle finishing region 7.
• Figure 14 schematically depicts the final step in the processing scheme whereby the forks (133, 134, 135 & 136) are disengaged from the bristle region. From this point, the brushes are indexed into the next processing step whereby brushhead 111 is moved into workstation 102, brushhead 112 is moved into workstation 102, brushhead 113 is moved into workstation 104, brushhead 114 is moved into workstation 105, and brushhead 115 goes on to packaging.
• Figure 15 depicts the toothbrush head

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• Brushes (AREA)
• Table Equipment (AREA)
• Details Of Garments (AREA)
• Acyclic And Carbocyclic Compounds In Medicinal Compositions (AREA)

Priority Applications (7)

Applications Claiming Priority (2)

Publications (1)

Family

ID=22777736

Family Applications (1)

Country Status (8)

Cited By (2)

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Citations (5)

Family Cites Families (9)

• 1994
  • 1994-03-11 US US08/209,189 patent/US5593213A/en not_active Expired - Lifetime
• 1995
  • 1995-03-09 DE DE69527190T patent/DE69527190T2/de not_active Expired - Lifetime
  • 1995-03-09 BR BR9507033A patent/BR9507033A/pt not_active Application Discontinuation
  • 1995-03-09 EP EP95913638A patent/EP0749282B1/de not_active Expired - Lifetime
  • 1995-03-09 AT AT95913638T patent/ATE219640T1/de not_active IP Right Cessation
  • 1995-03-09 WO PCT/US1995/003017 patent/WO1995024142A1/en active IP Right Grant
  • 1995-03-09 AU AU19949/95A patent/AU690655B2/en not_active Ceased
• 1996
  • 1996-09-05 NO NO963710A patent/NO963710L/no unknown

Patent Citations (5)

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